Low phase noise crystal oscillator Ceramic package with a seam sealed metal lid, hermetically sealed For standard 2.5 x 2 package oscillators please see our CFPS-53, CFPS-54, CFPS-55 and CFPS-56 series Frequency Parameters Frequency Frequency Stability Ageing 26.0MHz to 44.0MHz ±30.00ppm to ±100.0.